Sun-Nam

Sun-Nam Lee, Suwon-Si KR

Patent application number

Description

Published

20080250144

METHOD AND APPARATUS FOR CONTROLLING TRANSMISSION OF CONTENT DATA - Provided are a method and apparatus for controlling transmission of content data. In the method, a communication channel is initially established to transmit the content data, the content data is transmitted through the established communication channel, verification is performed a plurality of times to determine whether the content data is transmitted within an acceptable transmission range, and whether to continue the transmission of the content data is determined according to the verification result. Accordingly, when a client moves to a location outside a predetermined acceptable transmission range in a wireless environment, a server stops transmission of the content data. In addition, content data can be continuously transmitted regardless of interference caused by a temporary obstacle between a server and a client.

10-09-2008

20080250403

METHOD AND APPARATUS FOR GENERATING FIRMWARE UPDATE FILE AND UPDATING FIRMWARE BY USING THE FIRMWARE UPDATE FILE - Provided is a method of limiting updating of firmware by distinguishing between model code that represents a group of hardware having firmware program codes are compatible with each other and model code that identifies each hardware belonging to the group. The method includes generating a data body having firmware program code that is to be updated; generating a data header having model code of hardware to which the data body is to be applied, wherein the hardware model code comprises first model code representing a group of hardware having firmware program codes are compatible with each other and second model code identifying each hardware belonging to the group; and generating a firmware update file by combining the data body and the data header.

10-09-2008

20080256527

METHOD OF GENERATING FIRMWARE UPDATE FILE, METHOD AND APPARATUS FOR UPDATING FIRMWARE BY USING THE FIRMWARE UPDATE FILE - Provided are a method of generating a firmware update file which restrictively allows a firmware update for a corresponding hardware model, and a method and apparatus for updating firmware using the firmware update file. By generating a data body including program codes of firmware to be updated, generating a data header including model codes of a hardware device to which the data body is applied, and generating the firmware update file by combining the data body and the data header, the firmware update may be restricted for a corresponding model of a hardware device by using the firmware update file so that firmware of other models of hardware devices may not be updated, an integrity check may be performed using a digital signature when the firmware is updated.

10-16-2008

20090274305

METHOD AND APPARATUS FOR TRANSMITTING CONTENT KEY - Provided is a method of transmitting content keys to nodes arranged in a hierarchical structure which includes a plurality of node groups each including a predetermined number of the nodes. In this method, revoke information that includes identifiers of revoked node groups in the hierarchical structure, the total number of independent revoked nodes, and identifiers of the independent revoked nodes is generated. The revoked node groups are node groups consisting of only revoked nodes, and the independent revoked nodes are revoked nodes not belonging to any of the revoked node groups. Then, encrypted content keys are obtained by encrypting content keys using broadcast encryption, by using an encryption key set that has a form that cannot be generated using a decryption key set that the revoked nodes possess, and a set of encrypted content keys is generated. Thereafter, the revoke information and the set of the encrypted content keys are transmitted to all of the nodes arranged in the hierarchical structure.

11-05-2009

20090304185

METHOD OF TRACING DEVICE KEYS FOR BROADCAST ENCRYPTION - Provided are a method of tracing a device key in a user key management system using a hierarchical hash chain broadcast encryption scheme (HBES) algorithm, a user key management system for executing the method of tracing a device key, and a computer program for executing the method of tracing a device key. The method of tracing a device key of an illegal decoder in a user key management system for broadcast encryption includes: tracing a device key using a binary search; and revoking the traced device key. The technology according to the present invention can be applied to prevent exposure of the device keys to hacking. The present invention provides a method of tracing which can be applied to an HBES algorithm structure.

12-10-2009

20110142227

METHOD AND APPARATUS FOR ENCODING DATA AND METHOD AND APPARATUS FOR DECODING DATA - A method and apparatus for encoding data, and a method and apparatus for decoding data. The method of encoding data including generating first encoded data by encoding input data, dividing the first encoded data into a plurality of segments, and generating second encoded data by combining the plurality of segments and dummy data.

Sun-Nam Moon, Changwon-Si KR

Sun-Nam Moon, Gyeongnam KR

Patent application number

Description

Published

20090038117

DOOR SUPPORTING DEVICE FOR REFRIGERATOR - The present invention relates to a door supporting device for a refrigerator. The door supporting device of the present invention can adjust the height of the door. A hinge bracket of the door supporting device of the present invention includes a fixing portion fixed to a front face of the refrigerator, and a supporting portion extending forward from an upper end of the fixing portion and having a threaded hole with threads formed on an inner periphery thereof. A hinge shaft of the door supporting device has threads on an outer periphery thereof and is threadly engaged with the threaded hole so that the hinge shaft can be supported by the hinge bracket. An upper end of the hinge shaft rotatably supports the door. The height of the door can be adjusted by rotating the hinge shaft. A nut is threadly engaged with the hinge shaft below the hinge bracket. The nut prevents the hinge shaft from being rotated so that the door can be constantly maintained at a predetermined height. The door supporting device further comprises a hinge cap fitted around the upper end of the hinge shaft and inserted into a hinge hole formed in a bottom surface of the door so as to rotatably support the door. The hinge cap comprises a rearward extension and a rotation preventing projection extending downward from the extension, and the rotation preventing projection is inserted into a fixing hole of the hinge bracket so as to restrict rotation of the hinge cap.